Device for reproducing sound.



W. H. CRAWFORD.

DEVICE FOR REPRODUCING SOUND.

APPLICATION FILED APR. 29. 1915.

l 1 92,828.. Patented July 25, 1916.

I f Wu meson: 8 vwemtoz saw/Z54 GMKWZ W IT D STAWAEENTD WILLIAM CRAWFORD, on rnovI ENo RHODE ISLAND, Assieivon orbits-HALF r OLIVER FLETCHER BEST,. or PROVIDENCE, RHODE ISLAND.

I DEVICE FOR cilln h'om'itinuyconcern: f

. Be: itjknown. that I, lVrLLrx r HQCrAw ronn, a citizen of the United States of America, and a resident of Providence,

5 county "of Providence, State of Rhode Island, have invented certain new and useful Improvements in Devices for Reproducing Sound, of which the following is a specification.

ments in a device for reproducing sound, especially in talking machines and the like. \Vhen'music, articulate speech and other sounds are reproduced, in a phonograph for instance,

the stylus passes through the record grooves, to the rod fulcrumed to the sound boxwhich in turn acts on the diaphragm and thereby the. original vibrations are-repeated. The

providing means capable of confining an elastic medium, betWeen'the stylus and therodwvhich is fulcrumed to the sound box.

In this Way the original vibratlons are..im-

parted to an elastic medium, such .as air, before .being further .transmitted.

This results in the elimination of the disagreeable:

sounds and secondary noises. It is known that a confined body of an elastic me- QO diuin or fluid, such as. air is capable of transmitting sympathetic vibrations and the interposition of a confined body of anmedium eliminates disagreeableelastic.

noises.- The reprosounds' and secondary duccd sound resulting veyed from the reproducer or sound box into the amplifierin the usual. manner except that no disagreeablesounds or secondary noises are conveyedand amplified but merely pure tones.

The invention is. illustrated in the' accompanying drawing-1n which:-

Figure ,1 represents sideyelevation a1 fined-elastic. el'ementehmmates the d sagree- 'phonograph embodying. desirable form parts in all the figures.

This invention has reference to improve-- thin shrieking sounds and secondary noises are audible wh ch distract the at 'tentlon of the listeners, mpa1r the quality 'noyel improvements hav ebeen atta'inedby screw justably held therein.- 7 slight adjustment of the cylinder 5. with'the 9 serted into the stylus supp from the repeated vibrations of the diaphragm is further conreasons herein stated the body ofthe con REPnoDUome souivn.

Specification of Letters'latent. I P te t d July 1916; I

Application filed April 29, 1915. Serial No. 24,625. i

.upper mechanism shown in Fig. l, "certain parts beingin section. Fig. 4 is a'rear-view 60. of Fig. 3, partly broken awayQ 1. Similar characters of reference denote like In the drawings, inTFigQ 1, 0 represents the. phonograph box. and?) is: the record. je5 The amplifying horn c is partly shown and the reproducer"connection d is in' c'om'rr'u'l nication with the reproducer or sound flbox- 6 From the sound box the rod 7 which acts Jon the diaphragm 70, as; shown in Fig. 2,'extends downwardly and is' fulorurnedto the sound box e-as shown at g. Theirod f. is. bent horizontally below the fulcrum .g. and ex- 'f tends into a. small cylinder 'h which houses two small pistons uh 72. The horizontal .75.

portion 7' of the rod 7 is'connectedto-the small piston Between the two small.

tons k h -fmay be supported on "the machine by means of a ring Z- mounted behind ;the sound box e adjoiningto the reproducer connection cl. Integral with the ring Z-there is a vertical support: 2". "The support-Z forms a tube through. which passes a' set m. To: the cylinder it a horizonta supporting member a is secured as shown to -99 the left in Fig. 3. From the support at a con nectingro'd n extends first ho'r' zontally and then vertically into the suppor l -and is ad- This allows-of a.

istons therein which 'support one therod and the other the stylus support 2'. Assuming that a. new stylus has been inort' and properly. adjusted therein then, upon starting the ma: 100 chine, the stylus travels in the record grooves and the original vibrations will be transfmitted through. thestylus support, the-pis-" ton 7f, the confined'body of an elastlciile-f '1nent,'suchfa's' air, the piston h andgthe lfu'l crumed rod f which acts on the diaphragm whereby the. original wj'ibratlons are repeated and-sound islrep'roduced. For the for transmitting the original vibrations com ablesounds and secondary noises and solely for. transmitting the original vibrations comprising a cylinder, two i pistons in the cyl- 1 inder leaving aspace between them Where 10 in air is confined, a rod on one piston connecting with the sound box, a support on theother piston, and a stylus in the said support.

, '2. In a "talking machine and the like, a

device for reproducing sound having means prising a cylinder, two pistons in the cyl- .ln'der wherein an elastic fluid is confined, a. rod on one piston, a diaphragm on WlllCll' supporting the cylinder.

and the like, a V

cylinder leaving a space between" them wherein a-n'elastic' fluid is confined, a .ful-

.crumed rod on one piston, a diaphragm on which the rodacts, a stylus support onthe second piston a stylus thereinand means for Signed at NeW'York N. Y, this 27th day of April, 1915; WILLIAM H. CRAWFORD.

Witnesses I A C. ROLAND, ELEANORE J. Ilorrmanxv,' ;v 

